Question

circulatory systems help to overcome which of the following physiological challenges?
a the slow rate at which diffusion occurs over large distances
b temperature differences between the lungs and the active tissue
c the problem of communication systems involving only the nervous system
d the need to cushion animals from trauma

Explanation:

The circulatory system transports substances (such as oxygen, nutrients, and waste) throughout the body. Diffusion is effective over short distances but slow over large distances. The circulatory system overcomes this by having a pump (heart) and vessels to move substances quickly over long distances. Option B: Temperature differences are not the main challenge the circulatory system overcomes. Option C: The circulatory system is not mainly about communication (nervous and endocrine systems handle communication more). Option D: Cushioning from trauma is more related to other body structures (like connective tissues, not the main function of the circulatory system).

Answer:

A. the slow rate at which diffusion occurs over large distances